Python · Theory

format(value)

Theory

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format(value)

format is a string helper. You call it on text like "Asha" or "banana". It gives a new string (or a number/True-False). The old string does not change unless you assign the result back.

format(value) — output — 090. Width 3, pad with zeros.

Fresher trap: writing s.format() and expecting s to update. Strings are immutable. Write s = s.format(...) if you need the new value (when it returns a string).

Exam tip

Call format on one real word and say what prints.

Example

# format(value)
print(format(90, "03d"))

format(value) — output: 090. Width 3, pad with zeros.

Short notes

Defformat works on str.
Ruleformat usually returns a new string.
Trapformat does not change the original string in place.

Python · Theory

format(value)

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Theory

216/268

format(value)

format is a string helper. You call it on text like "Asha" or "banana". It gives a new string (or a number/True-False). The old string does not change unless you assign the result back.

format(value) — output — 090. Width 3, pad with zeros.

Fresher trap: writing s.format() and expecting s to update. Strings are immutable. Write s = s.format(...) if you need the new value (when it returns a string).

Exam tip

Call format on one real word and say what prints.

Example

# format(value)
print(format(90, "03d"))

format(value) — output: 090. Width 3, pad with zeros.

Short notes

Defformat works on str.
Ruleformat usually returns a new string.
Trapformat does not change the original string in place.

format(value)

Example

Short notes

Questions

format(value)

Example

Short notes

Questions